Chef Juliette
Oriental Sauce
Sauce Orientale concentrates lobster-rich American Sauce with curry, then folds in cream away from the fire: a glossy, gently spiced derivative made for lobster, crayfish, and firm fish.
Culinary Explorer
A cooking platform built around craft, culture, and the stories behind what we eat.
Mustard Sauce
Created by Chef Juliette
Sauce Moutarde teaches the discipline of finishing off the fire: warm butter sauce, Dijon mustard, and no boiling, spooned generously over grilled herring or other small fish.
Sauces & Condiments
French
Comfort Food
Weeknight
5 min
Active Time
10 min cook•15 min total
YieldAbout 2 quarts
Sauce Moutarde teaches the quiet discipline of finishing an emulsion away from heat. The mustard isn't cooked into submission. It is whisked into warm butter sauce so its bite stays clear while the sauce remains glossy. One true thing before you touch the pan: once the mustard goes in, boiling is forbidden.
The original formula assumed a saucier with finished butter sauce ready to hand, enough service to use any necessary quantity, and a bain-marie waiting beside the range. At home, use about two quarts of prepared butter sauce, keep the book's exact ratio of one tablespoon of mustard per pint, and turn a wide skillet of warm water into the bain-marie, a hot-water bath for holding the sauce. The service scaffolding goes; the off-fire finish and the ratio stay, because they are the dish. One cook, one stove, one evening.
Expect an ivory sauce with a Dijon-gold cast, rich first and brisk at the finish, made for grilled small fish and fresh herring above all. The one step that matters is the last one: lift the pan, whisk in the mustard off the fire, and never let the Sauce Moutarde boil while it waits.
Sauce Moutarde belongs to the classical French sauce repertoire shaped in the grand kitchens of Paris rather than to a single provincial larder. Its particular companionship with fresh herring and other small grilled fish connects that formal repertoire to the Channel and North Sea coasts of northern France, where herring has fed households for generations. The name often covers cream sauces and reduced pan sauces, but this canonical form is simpler: prepared butter sauce and mustard, joined away from the fire so the mustard keeps its edge.
The technique, the tradition, and the story behind every dish.
Discover Culinary ExplorerIngredients
prepared butter sauce
Quantity
2 quarts (8 cups / 1.9 L / about 1.9 kg)
smooth Dijon mustard
Quantity
4 level tablespoons (60 ml / about 60 g)
cool water (optional)
Quantity
1 tablespoon (15 ml / 15 g)
only if needed to rescue a split sauce
| Ingredient | Quantity |
|---|---|
| prepared butter sauce | 2 quarts (8 cups / 1.9 L / about 1.9 kg) |
| smooth Dijon mustard | 4 level tablespoons (60 ml / about 60 g) |
| cool water (optional)only if needed to rescue a split sauce | 1 tablespoon (15 ml / 15 g) |
Equipment Needed
- •4-quart heavy saucepan
- •12-inch deep skillet for the bain-marie
- •Balloon whisk
- •Ladle
Instructions
- 1
Prepare the bain-marie
Pour about 1½ inches of water into a wide, deep skillet and heat it until hot but nowhere near simmering. Lower the heat completely. This bain-marie will hold the finished sauce without attacking its butter emulsion; it is a holding bath, not a second cooking fire.
- 2
Warm the butter sauce
Put the prepared butter sauce into a heavy 4-quart saucepan and warm it over the lowest heat, whisking gently until it is smooth, glossy, and hot enough to serve. Stop before even the smallest bubble appears. The foundation is already cooked, so this step restores its serving texture and nothing more.
Use a saucepan with generous headroom. Two quarts of sauce in a two-quart pan leaves no room to whisk properly and invites butter onto the stove. - 3
Finish off the fire
Lift the saucepan completely off the burner. Add the Dijon mustard one tablespoon at a time, whisking each addition through the warm sauce before adding the next. The sauce should remain glossy, with no mustard streaks and no oil gathering at the rim. If it separates into oily beads, stop. Ça se rattrape: put the cool water in a clean bowl, then whisk the split sauce into it one ladleful at a time until the emulsion becomes smooth again. Do not return it to direct heat.
- 4
Hold without boiling
Nest the saucepan in the prepared bain-marie, with the water reaching partway up its sides but unable to splash into the sauce. Hold over the lowest heat and stir every few minutes. It must not boil under any circumstances. If the bath begins bubbling, remove the whole arrangement from the heat and replace a little hot water with cool water before continuing.
- 5
Sauce the fish
Serve the Sauce Moutarde within 30 minutes, while it is warm, glossy, and still brisk with mustard. Spoon it over freshly grilled herring or another small oily fish just before the plate reaches the table. The fish supplies smoke and richness; the mustard supplies the clean edge. À table!
Chef Tips
- •Use smooth Dijon mustard, neither whole-grain nor sweetened. Whole mustard seeds change the sauce's texture, while a sweet prepared mustard blunts the clean, sharp finish the formula requires.
- •The proportion is the recipe: one tablespoon of mustard per pint of butter sauce. For a smaller batch, use 1½ teaspoons of mustard for every 1 cup of butter sauce. Reduce the quantity, never the ratio.
- •The bain-marie should feel calm. Water that bubbles is hot enough to push the sauce toward splitting, so lower the heat or move the bath off the stove before the sauce suffers for it.
- •Fresh herring is the first companion, but fresh sardines or small mackerel also have enough richness to meet the mustard. Grill the fish plainly and let the Sauce Moutarde provide the finish.
- •We don't apologize for butter, and we don't replace it with margarine or spreadable substitutes. This sauce depends on the butter emulsion for its gloss, body, and clean finish.
Advance Preparation
- •Have the prepared butter sauce at a smooth serving temperature and measure the mustard before the fish goes to the grill. Once the fish is cooking, the finish takes only moments.
- •Complete the Sauce Moutarde no more than 30 minutes before serving. The butter sauce may wait according to its own method, but mustard loses its bright edge during a long hold.
- •Do not plan to boil or reduce leftovers. Chill them promptly, then rewarm with very gentle heat; if the emulsion separates, use the cool-water rescue given in the method.
Frequently Asked Questions
Nutrition Information
1 serving (about 30g)
Calories
180 calories
Total Fat
19 g
Saturated Fat
12 g
Trans Fat
1 g
Unsaturated Fat
6 g
Cholesterol
55 mg
Sodium
150 mg
Total Carbohydrates
1 g
Dietary Fiber
0 g
Sugars
0 g
Protein
0 g
Where cooking meets culture.
Culinary guides, cultural storytelling, and the editorial depth that makes cooking meaningful.
Discover Culinary ExplorerMore from The Small Compound Sauces - Small White and Compound Sauces
Browse the full collection
Chef Juliette
Poulette Sauce
An old lesson in sauce families: Sauce Allemande takes mushroom liquor, then butter, lemon, and parsley, becoming a glossy Poulette for sheep's trotters, leeks, cauliflower, and anything needing gentle richness with a bright edge.
Chef Juliette
Ravigote Sauce
Sauce ravigote turns a calm velouté lively with white wine, vinegar, shallot butter, and three fresh herbs, a sharp green finish made for boiled poultry and the pale richness of white abats.
Chef Juliette
Regency Sauce
Sauce Régence turns a finished velouté into a deep, silken accompaniment through mushroom, truffle, and concentrated glaze, proving that gentle reduction, not ornament, gives a derivative sauce its authority.